Lightweight recyclable apparel with stretch properties

ABSTRACT

Aspects herein are directed to a lightweight, recyclable, double-knit textile used to form a recyclable, apparel item having stretch properties. The double-knit textile utilizes a combination of yarns, including a recyclable, elastic thermoplastic polyurethane (TPU) polymer yarn, in a knit construction where the technical face of the textile is formed form a non-elastic yarn such as a polyamide yarn, the technical back of the textile is formed the non-elastic yarn and the TPU polymer yarn in a plated relationship, and linking yarns that extend between the technical face and the technical back include the non-elastic yarn. The knit construction as described balances the need for opacity, optimal stretch features, support, and durability to an apparel item formed from the textile while still being lightweight.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application, having attorney docket number 351663/190192US02 and entitled “Lightweight Recyclable Apparel with Stretch Properties,” claims the benefit of priority of U.S. Prov. App. No. 62/975,969, filed Feb. 13, 2020, and entitled “Lightweight Recyclable Apparel with Stretch Properties.” The entirety of the aforementioned application is incorporated by reference herein.

TECHNICAL FIELD

Aspects herein relate to a double-knit textile and apparel items formed from the double-knit textile where the apparel item is lightweight, recyclable, and has stretch properties suitable for athletic wear.

BACKGROUND

Spandex yarns are traditionally used to impart stretch properties to athletic apparel. However, spandex yarns are generally not recyclable which impacts the ability of the apparel item to be recycled.

SUMMARY

The following clauses represent example aspects of concepts contemplated herein. Any one of the following clauses may be combined in a multiple dependent manner to depend from one or more other clauses. Further, any combination of dependent clauses (clauses that explicitly depend from a previous clause) may be combined while staying within the scope of aspects contemplated herein. The following clauses are illustrative in nature and are not limiting.

Clause 1. A double-knit textile used to form an apparel item, the double-knit textile comprising: a technical face formed from a polyamide yarn; a technical back formed from the polyamide yarn and a thermoplastic polyurethane polymer yarn in a plated relationship; and a plurality of linking yarns that extend between the technical face and the technical back of the double-knit textile, the plurality of linking yarns including the polyamide yarn.

Clause 2. The double-knit textile used to form the apparel item according to clause 1, wherein the thermoplastic polyurethane polymer yarn is a monofilament yarn having a denier from about 60 denier to about 80 denier.

Clause 3. The double-knit textile used to form the apparel item according to any of clauses 1 through 2, wherein the denier of the thermoplastic polyurethane polymer yarn is about 70 denier.

Clause 4. The double-knit textile used to form the apparel item according to any of clauses 1 through 3, wherein the polyamide yarn has a denier from about 38 denier to about 45 denier.

Clause 5. The double-knit textile used to form the apparel item according to any of clauses 1 through 4, wherein the denier of the polyamide yarn is about 40 denier.

Clause 6. The double-knit textile used to form the apparel item according to any of clauses 1 through 5, wherein the polyamide yarn has from about 30 filaments to about 40 filaments per yarn.

Clause 7. The double-knit textile used to form the apparel item according to any of clauses 1 through 6, wherein the polyamide yarn has about 34 filaments per yarn.

Clause 8. The double-knit textile used to form the apparel item according to any of clauses 1 through 7, wherein the double-knit textile has a weight not exceeding 300 grams per square meter (gsm).

Clause 9. The double-knit textile used to form the apparel item according to any of clauses 1 through 8, wherein the weight of the double-knit textile is from about 220 gsm to about 240 gsm.

Clause 10. An apparel item for athletic wear, the apparel item comprising: a double-knit textile used to form the apparel item, the double-knit textile comprising: from 65% to 70% by weight of polyamide yarn; and from 30% to 35% by weight of thermoplastic polyurethane polymer yarn, the double-knit textile having a weight not exceeding 300 grams per square meter (gsm).

Clause 11. The apparel item for athletic wear according to clause 10, wherein the double-knit textile comprises a technical face formed from the polyamide yarn and a technical back formed from the polyamide yarn and the thermoplastic polyurethane polymer yarn in a plated relationship.

Clause 12. The apparel item for athletic wear according to clause 11, wherein the technical face does not include the thermoplastic polyurethane polymer yarn.

Clause 13. The apparel item for athletic wear according to any of clauses 11 through 12, wherein the double-knit textile includes a plurality of linking yarns that extend between the technical face and the technical back, the plurality of linking yarns including the polyamide yarn.

Clause 14. The apparel item for athletic wear according to any of clauses 10 through 13, wherein the weight of the double-knit textile is from about 220 gsm to about 240 gsm.

Clause 15. The apparel item for athletic wear according to any of clauses 10 through 14, wherein the thermoplastic polyurethane polymer yarn is elastic, and wherein the polyamide yarn is not elastic.

Clause 16. The apparel item for athletic wear according to any of clauses 10 through 15, wherein the apparel item is an athletic tight.

Clause 17. The apparel item for athletic wear according to any of clauses 10 through 15, wherein the apparel item is an athletic shirt.

Clause 18. The apparel item for athletic wear according to any of clauses 10 through 15, wherein the apparel item is a sport bra.

Clause 19. A method of manufacturing an apparel item for athletic wear, the method comprising: forming a double-knit textile into the apparel item, the double-knit textile comprising: from 65% to 70% by weight of polyamide yarn; and from 30% to 35% by weight of thermoplastic polyurethane polymer yarn, the double-knit textile having a weight not exceeding 300 grams per square meter (gsm).

Clause 20. The method of manufacturing the apparel item for athletic wear according to clause 19, wherein the double-knit textile comprises a technical face formed from the polyamide yarn and a technical back formed from the polyamide yarn and the thermoplastic polyurethane polymer yarn in a plated relationship, and wherein the technical back forms an inner-facing surface of the apparel item.

Clause 21. A double-knit textile used to form an apparel item, the double-knit textile comprising: a technical face; and a technical back, wherein one of the technical face or the technical back is formed from a polyamide yarn and a thermoplastic polyurethane polymer yarn, and wherein the double-knit textile has a weight not exceeding 300 grams per square meter (gsm).

Clause 22. The double-knit textile used to form the apparel item according to clause 21, further comprising a plurality of linking yarns that extend between the technical face and the technical back of the double-knit textile.

Clause 23. The double-knit textile used to form the apparel item according to any of clauses 21 through 22, wherein the thermoplastic polyurethane polymer yarn is a monofilament yarn having a denier from about 60 denier to about 80 denier.

Clause 24. The double-knit textile used to form the apparel item according to any of clauses 21 through 23, wherein the denier of the thermoplastic polyurethane polymer yarn is about 70 denier.

Clause 25. The double-knit textile used to form the apparel item according to any of clauses 21 through 24, wherein the polyamide yarn has a denier from about 38 denier to about 45 denier.

Clause 26. The double-knit textile used to form the apparel item according to any of clauses 21 through 25, wherein the denier of the polyamide yarn is about 40 denier.

Clause 27. The double-knit textile used to form the apparel item according to any of clauses 21 through 26, wherein the polyamide yarn has from about 30 filaments to about 40 filaments per yarn.

Clause 28. The double-knit textile used to form the apparel item according to any of clauses 21 through 27, wherein the polyamide yarn has about 34 filaments per yarn.

Clause 29. The double-knit textile used to form the apparel item according to any of clauses 21 through 28, wherein the weight of the double-knit textile is from about 220 gsm to about 240 gsm.

Clause 30. A method of recycling an apparel item formed from a double-knit textile comprising from 65% to 70% by weight of a polyamide yarn and from 30% to 35% by weight of a thermoplastic polyurethane polymer yarn, the double-knit textile having a weight not exceeding 300 grams per square meter (gsm), the method comprising: cutting the apparel item into a plurality of scrap pieces; supplying one or more of the plurality of scrap pieces to an extruder, wherein the extruder extrudes a film material formed from the one or more of the plurality of scrap pieces; and supplying the film material to a pelletizer to produce a plurality of pellets.

Clause 31. The method of recycling the apparel item according to clause 30, wherein the double-knit textile comprises a technical face formed from the polyamide yarn; a technical back formed from the polyamide yarn and the thermoplastic polyurethane polymer yarn in a plated relationship; and a plurality of linking yarns that extend between the technical face and the technical back of the double-knit textile, the plurality of linking yarns including the polyamide yarn.

BRIEF DESCRIPTION OF THE DRAWINGS

Examples of aspects herein are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 illustrates a schematic depiction of a knit structure for an example double-knit textile in accordance with aspects herein;

FIG. 2 illustrates an example lower-body apparel item formed from the double-knit textile of FIG. 1 in accordance with aspects herein;

FIG. 3 illustrates an example upper-body apparel item formed from the double-knit textile of FIG. 1 in accordance with aspects herein;

FIG. 4 illustrates an example support garment formed from the double-knit textile of FIG. 1 in accordance with aspects herein;

FIG. 5 illustrates a flow diagram of an example method of manufacturing an apparel item for athletic wear in accordance with aspects herein; and

FIG. 6 illustrates a flow diagram of an example method of recycling an apparel item formed from the double-knit textile described herein in accordance with aspects herein.

DETAILED DESCRIPTION

The subject matter of the present invention is described with specificity herein to meet statutory requirements. However, the description itself is not intended to limit the scope of this disclosure. Rather, the inventors have contemplated that the claimed or disclosed subject matter might also be embodied in other ways, to include different steps or combinations of steps similar to the ones described in this document, in conjunction with other present or future technologies. Moreover, although the terms “step” and/or “block” might be used herein to connote different elements of methods employed, the terms should not be interpreted as implying any particular order among or between various steps herein disclosed unless and except when the order of individual steps is explicitly stated.

Spandex yarns are traditionally used to impart stretch properties to apparel especially athletic apparel. However, spandex yarns are generally not recyclable which impacts the ability of the apparel item to be recycled. Additionally, spandex yarns typically exhibit a steep stress/strain curve meaning that there is a rapid increase in resistance to stretch as the spandex yarn is stretched past a certain length (e.g., past 100% of its original length). This may make athletic apparel incorporating spandex yarns for stretch less conforming to the body shape of a wearer. It may also cause the apparel item to be restrictive during certain movements. In addition, it is often desirable to form athletic apparel using a double-knit construction to provide opacity for modesty purposes. However, traditional double-knit textiles that exhibit stretch properties may have a fabric weight heavier than desirable due to the types of yarns used and the knit construction.

Aspects herein are directed to a lightweight, recyclable, double-knit textile used to form a lightweight, recyclable apparel item having superior stretch properties. The double-knit textile utilizes a combination of yarns, including a recyclable, elastic thermoplastic polyurethane (TPU) polymer yarn, in a knit construction where the technical face of the textile is formed form a non-elastic yarn such as a polyamide yarn, the technical back of the textile is formed the non-elastic yarn and the TPU polymer yarn in a plated relationship, and linking yarns that extend between the technical face and the technical back include the non-elastic yarn. The knit construction as described balances the need for opacity, optimal stretch features, support, and durability in an apparel item formed from the textile while still being lightweight (e.g., not exceeding 300 grams per meter squared (gsm)).

In example aspects, the elastic TPU polymer yarn may exhibit a stress/strain curve that is less steep than, for example, the stress/strain curve associated with typical spandex yarns. As such, the double-knit textile may have less resistance to stretch as the TPU polymer yarn is stretched past a certain length or width (e.g., past 100% of its original length or width). Stated differently, less force may be needed to stretch the double-knit textile described herein past a certain length or width. The result of this is that the double-knit textile more easily conforms to the body shape of a wearer thereby improving wearer comfort. The double-knit textile also facilitates wearer movement through a wide range of motion. In addition, the double-knit textile contemplated herein exhibits a high rate of recovery after being stretched in both a lengthwise and a widthwise direction which enhances both the short-term and the long-term wearability of apparel items formed from the textile.

As used herein, the term “apparel item” or “athletic apparel item,” means an apparel item configured to be worn by a wearer. In example aspects, the apparel item may be worn while the wearer engages in athletic activities. The apparel item may be in the form of a lower-body apparel item, that in some aspects may be form-fitting, such as a legging, tight, capri, short, and the like; an upper-body apparel item, that in some aspects may be form-fitting, such as a shirt or pullover; a support garment such as a sport bra or sport tank, and the like. The term “outer-facing surface” when referring to the apparel item means the surface facing away from the body of a wearer and toward the external environment. The term “inner-facing surface” when referring to the apparel item means the surface facing inwardly or toward the body of the wearer. The term “outermost-facing surface” means the surface that is located furthest away from the body of the wearer with respect to other layers or components of the apparel item, and the term “innermost-facing surface” means the surface that is located closest to the body of the wearer with respect to other layers or components of the apparel item.

The term “double-knit textile” as used herein refers to a knit construction formed on a knit machine with two needle beds. Example machines may include a V-bed flat knit machine, a double jersey circular knit machine, and the like. The double-knit textile includes a technical face that is knit on one of the needle beds, and a technical back that is knit on the remaining needle bed of the knit machine. When looking at the technical face and the technical back of the double-knit textile, both sides may look like the technical face of a single-knit jersey and contain face loops or weft knit loops. In example aspects, and as described herein, linking yarns may be used to connect the technical face and the technical back of the double-knit textile where the linking yarns pass back and forth between the two different needle beds. The double-knit textile may be formed on a machine where the needles in one bed are directly opposite the needles in the other bed (known as interlock gaiting). It is also contemplated herein that the double-knit textile may be formed on a machine where the needles in one bed are directly opposite spaces in the other bed (known as rib gaiting). In one example aspect, the double-knit textile may be formed on a 28 gauge interlock circular weft knit machine.

The term “knit course” as used herein is a predominantly horizontal row of knitted loops (in an upright fabric as knit) produced by adjacent needles during the same knitting cycle. The knit course may include one or more stitch types such as a loop stitch, a held stitch, a float stitch, a tuck stitch, a transfer stitch, and the like as these terms are known in the art of knitting. The term “knit stitch” as used herein refers to a knit loop formed by a needle during a knitting cycle where the knit stitch may be interlooped with adjacent knit stitches in example aspects. The term “plating” as used herein means a knit construction where a first yarn (e.g., a base yarn) and a second yarn (e.g., a plating yarn) are knit in the same knit stitch using, for instance, a base yarn feeder and a plating yarn feeder.

The term “polyamide yarn” as used herein refers to yarn that includes one or more long-chain synthetic fibers or filaments with recurring amide groups that contain carbon, oxygen, nitrogen, and hydrogen. Nylon is a commonly used term for a polyamide yarn. The term “thermoplastic polyurethane (TPU) polymer yarn,” refers to a yarn formed from thermoplastic polyurethane. In aspects, the yarn may be entirely formed from thermoplastic polyurethane. In one example aspect, the TPU polymer yarn may be X4zol™-J Fiber produced by The Lubrizol Corporation with headquarters in Wickliffe, Ohio. TPU is known to be recyclable.

The term “elastic” as used herein when referring to yarns such as the TPU polymer yarn, means the ability of the strained yarn to substantially recover its original length (e.g, within about 10% or more of its original length) within 60 seconds after removing the stress. A non-elastic yarn may exhibit a degree of mechanical stretch but does not substantially recover its original length (e.g, within about 10% or more of its original length) within 60 seconds after removing the stress.

Several different testing methods are used herein to measure different properties of the double-knit textile. For example, when determining the percentage by weight of the different yarn types in the double-knit textile, AATCC 20A (2018) testing method is used. When determining the weight of the double-knit textile in grams per meter squared (gsm), ISO 3801, Method 5 is used. When measuring the textile growth and textile stretch of the double-knit textile, ASTM D2594 testing method is used, and when measuring the tension and elongation properties of the double-knit textile, ASTM D4964 testing method is used. The term “about” as used herein means within ±5% of a given value.

FIG. 1 is a schematic depiction of a knit structure of a double-knit textile 100 as positioned on a knit machine. The double-knit textile 100 includes a technical face 110 knit on a first bed 103 of the knit machine and a technical back 112 knit on a second bed 105 of the knit machine. When the double-knit textile 100 is incorporated into an apparel item, the technical face 110 forms an outer-facing surface of the apparel item, and the technical back 112 forms an inner-facing surface of the apparel item. Needles on the knit machine are illustrated as black circles. Thus, the first bed 103 of the knit machine includes a first set of needles 106, and the second bed 105 of the knit machine includes a second set of needles 107. Although the first bed 103 and the second bed 105 of the knit machine are shown in a rib gaiting configuration, it is contemplated herein that the first bed 103 and the second bed 105 may be in an interlock gaiting configuration.

The technical face 110 of the double-knit textile 100 is formed from a first yarn 114 (shown without shading). In example aspects, the first yarn 114 may be knit in a plurality of knit courses 116 (one of which is shown), where each knit course 116 includes consecutive interlooped knit stitches, such as knit stitch 118. It is also contemplated herein that the knit courses 116 may include additional or alternative stitch types using the first yarn 114 such as a missed stitch, a float stitch, a tuck stitch, and the like.

In example aspects, the first yarn 114 is a non-elastic polyamide yarn having a denier from about 30 to about 50, from about 35 to about 48, from about 38 to about 45, or about 40 denier. Selection of this denier range, and particularly the selection of 40 denier, contributes to the lightweight nature of the double-knit textile 100. Deniers greater than about 50 would increase the weight of the double-knit textile 100 beyond the desired weight, and deniers less than about 30 would decrease the durability of the double-knit textile 100 and would fail to provide the needed opacity for modesty. The polyamide yarn may have from about 25 filaments to about 45 filaments per yarn, from about 30 filaments to about 40 filaments per yarn, from about 32 filaments to about 38 filaments per yarn, or about 34 filaments per yarn. Selection of this filament range also contributes to the lightweight nature of the double-knit textile 100 while still providing opacity and durability to the double-knit textile 100. Additionally, the polyamide yarn may be draw textured to improve the hand feel of the double-knit textile 100.

Selection of a polyamide yarn for the first yarn 114 provides a number of different advantages. For instance, polyamide fibers/filaments have a low specific gravity (about 1.13) making the polyamide yarn lightweight. Polyamide yarns also have a high tensile strength and excellent resistance to abrasion making them an ideal yarn for forming an outer-facing surface of an apparel item fashioned from the double-knit textile 100 since the outer-facing surface of the apparel item may be subjected to greater amounts of abrasion as compared to the inner-facing surface of the apparel item. It is contemplated herein that the technical face 110 of the double-knit textile 100 may undergo to a peaching process to improve the hand feel of the double-knit textile 100. Because of its high tensile strength and excellent abrasion resistance properties, the polyamide yarn is able to undergo the peaching process without, for example, breakage of the yarn.

Additional advantages of using a polyamide yarn for the first yarn 114 include the low moisture regain properties of polyamide yarns (about 4.0) where moisture regain is defined as the percentage of moisture an oven-dry fiber or filament will absorb from the air when at standard temperature and relative humidity. Because polyamide yarns do not absorb large amounts of water or perspiration, they may facilitate the spreading out of perspiration produced by the wearer on the outer-facing surface of an apparel item formed from the double-knit textile 100 through, for example, capillary action where it can subsequently evaporate thereby improving wearer comfort. As will be explained further below, polyamide yarns typically can by dyed at lower temperatures than, for instance, polyethylene terephthalate (PET) yarns (commonly known as polyester yarns). This may be advantageous when the polyamide yarn is combined with the TPU polymer yarn since prolonged exposure of some types of TPU polymer yarns to higher temperatures during the dyeing process may negatively impact the elastic properties of these TPU polymer yarns. A further advantage is that polyamide yarns are recyclable.

It is alternatively contemplated herein that the first yarn 114 may include a PET yarn when dyeing temperatures are not a concern for the TPU polymer yarn. PET yarns share similar features to polyamide yarns including recyclability, a low moisture regain (about 0.4), high tensile strength, lightweight (e.g., a specific gravity of about 1.4), and excellent resistance to abrasion.

The technical back 112 of the double-knit textile 100 is formed from the first yarn 114 and a second yarn 120 (shown with stipple shading) that are knit in a plated relationship. In example aspects, the first yarn 114 and the second yarn 120 may be knit in a plurality of knit courses 122 (one of which is shown), where each knit course 122 includes consecutive interlooped knit stitches, such as knit stitch 124. It is also contemplated herein that the knit courses 122 may include additional or alternative stitch types using the first yarn 114 and the second yarn 120 such as a missed stitch, a float stitch, a tuck stitch, and the like.

In example aspects, the second yarn 120 is an elastic TPU polymer yarn such as X4zol™-J Fiber described above. In example aspects, the TPU polymer yarn is a monofilament yarn having a denier from about 60 to about 80, from about 65 to about 75, from about 68 to about 72, or about 70 denier. Selection of this denier range, and particularly the selection of 70 denier, imparts density to the double-knit textile 100 which is important for modesty while still maintaining the lightweight features of the double-knit textile 100. For example, selection of a denier greater than about 80 would increase the weight of the double-knit textile 100 beyond the desired weight and selection of a denier less than about 60 would decrease the density of the double-knit textile 100. In addition, selection of a denier from about 60 to about 80 provides the double-knit textile 100 with the desired stretch properties. Using a denier lower than about 60 would impact, for instance, the desired recovery properties of the double-knit textile 100.

Besides being recyclable as opposed to spandex, the TPU polymer yarn and specifically X4zol™-J Fiber exhibits a stress/strain curve that is less steep than, for example, spandex meaning that there is less resistance to stretch when the TPU polymer yarn is stretched past a certain length such as, for example, from about 100% to about 200% of its original length. This translates to a more comfortable, body-conforming fit when the double-knit textile 100 is incorporated into an apparel item and also facilitates movement of the apparel item through a wide range of motion. Positioning the second yarn 120 so that it is present just on the technical back 112 of the double-knit textile 100 and not on the technical face 110 of the double-knit textile 100 provides the needed amount of stretch properties to the double-knit textile while maintaining the lightweight features of the double-knit textile 100. For instance, if the elastic second yarn 120 was knit in on both the technical face 110 and the technical back 112, the double-knit textile 100 would exceed the desired weight and would exhibit too much stretch making an apparel item incorporating the double-knit textile 100 difficult to don and doff and decreasing the level of support offered by the apparel item. Moreover, due to the low moisture regain of the TPU polymer yarn (about 1.3), positioning the TPU polymer yarn on the technical back 112 in combination with the polyamide yarn promotes the movement of moisture (by, for instance, capillary action) through the double-knit textile from the technical back 112 to the technical face 110 where it may evaporate thereby improving wearer comfort.

Plating the second yarn 120 with the first yarn 114 provides a number of different advantages. For example, plating the second yarn 120 with the first yarn 114 instead of knitting in the second yarn 120 as a separate course provides a needed opacity to the double-knit textile 100. Stated differently, if the second yarn 120 was knit in as a separate course, the double-knit textile would be too sheer for modesty purposes. Plating the second yarn 120 with the first yarn 114 also helps to protect the second yarn 120 by minimizing exposure of the second yarn 120 on the technical back 112 of the double-knit textile 100 as shown in FIG. 1. For instance, due to the plating process, the second yarn 120 is generally positioned under the first yarn 114 (i.e., the polyamide yarn) in the double-knit textile 100 which minimizes exposure of the second yarn 120 on the technical back 112. Stated differently, the polyamide yarn is the primary yarn exposed on the technical back 112 of the double-knit textile. This may be important because in example aspects, some TPU polymer yarns may have a tensile strength lower (and sometime substantially lower) than the tensile strength of the polyamide yarn which may make them prone to breakage when exposed to abrading mechanical forces. Thus, positioning the TPU polymer yarn under the polyamide yarn with its excellent abrasion resistance properties, protects the TPU polymer yarn from breakage and prolongs the usability of an apparel item incorporating the double-knit textile 100. In line with this, positioning the TPU polymer yarn so it is present just on the technical back 112 of the double-knit textile 100 prevents exposure of the TPU polymer yarn on the technical face 110 of the double-knit textile 100 which is typically subject to higher amounts of abrasion including abrasion that may occur during the peaching process.

The double-knit textile 100 further includes linking yarns 126 that extend between the technical face 110 and the technical back 112 of the double-knit textile 100. The linking yarns 126 comprise the first yarn 114 as it extends between the technical face 110 and the technical back 112. Stated differently, in example aspects, the first yarn 114 may form a knit stitch, such as the knit stitch 118, on the first bed 103, then transitions to the second bed 105 where it forms a knit stitch, such as the knit stitch 124, on the technical back 112 before transitioning back to the first bed 103 to form a knit stitch, and so on. Use of a polyamide yarn as the linking yarn 126 provides the double-knit textile 100 with needed stability and durability due to the high tensile strength of the polyamide yarn. As well, use of the linking yarns 126 helps to obscure the spaces between adjacent knit stitches on the technical face 110 and the technical back 112 of the double-knit textile 100 which contributes to the overall opacity of the double-knit textile 100.

Considering the double-knit textile 100 as a whole, the selection of the polyamide yarn for the first yarn 114 and the TPU polymer yarn, specifically X4zol™-J Fiber, for the second yarn 120 along with the knit construction as described provides functional benefits to the double-knit textile 100 compared to, for example, double-knit textiles that utilize spandex yarns for stretch properties. For example, use of the yarns as described makes the double-knit textile 100 fully recyclable. The TPU polymer yarn can be re-purposed into a number of different products that can be fed back into the apparel manufacturing process including TPU trim pieces. In addition, use of the polyamide yarn and the TPU polymer yarn, specifically X4zol™-J Fiber, allows the double-knit textile 100 to be dyed at a lower temperature. For example, polyamide yarns can typically be dyed at temperatures between 70 degrees Celsius to about 110 degrees Celsius while PET yarns are typically dyed at temperatures between 105 degrees Celsius and 140 degrees Celsius. The maximum recommended dyeing temperature for X4zol™-J Fiber is about 115 degrees Celsius, and dyeing X4zol™-J Fiber at temperatures higher than this may impact the structural integrity and elastic properties of X4zol™-J Fiber. Thus, combining X4zol™-J Fiber with polyamide yarns enables the double-knit textile 100 to effectively take up dyes at lower temperatures.

In another example, configuring the knit construction where the polyamide yarn forms the technical face 110 of the double-knit textile 100 and the polyamide yarn and the TPU polymer yarn are knit in a plated relationship to form the technical back 112 of the double-knit textile 100 provides an optimal percentage by weight of the first yarn 114 and the second yarn 120 as compared to if the TPU polymer yarn was knit in on both the technical face 110 and the technical back 112. For instance, in example aspects, the double-knit textile 100 may have from about 65% to about 70% by weight of polyamide yarn, from about 66% to about 68% by weight of the polyamide yarn, or about 67% by weight of the polyamide yarn. The double-knit textile 100 may have from about 30% to about 35% by weight of the TPU polymer yarn, from about 32% to about 34% by weight of the TPU polymer yarn, or about 33% by weight of the TPU polymer yarn.

The described weight percentages of the polyamide yarn and the TPU polymer yarn causes the double-knit textile 100 to have a weight not exceeding 300 gsm. More particularly, the double-knit textile 100 may have a weight from about 220 gsm to about 240 gsm, from about 225 gsm to about 235 gsm, or about 230 gsm. The lightweight features of the double-knit textile 100 make it ideal for use in athletic apparel items where less weight often translates to better performance and improved wearer comfort. In addition, the described weight percentages of the polyamide yarn and the TPU polymer yarn provide the desired stretch and support properties to the double-knit textile where the stretch properties are provided by the elastic TPU polymer yarn and the support properties are provided by the non-elastic polyamide yarn. For example, if the percentage of the TPU polymer yarn exceeds about 35%, the double-knit textile 100 may exhibit too much stretch and not enough support. If the percentage of the TPU polymer yarn is below about 30%, the double-knit textile 100 may not possess the desired stretch properties. Further, the described weight percentage of the polyamide yarn contributes to the overall durability/stability of the double-knit textile 100 due to the high tensile strength and excellent abrasion resistance properties of polyamide yarns.

Use of the TPU polymer yarn, specifically X4zol™-J Fiber with its low stress/strain curve provides the double-knit textile 100, and articles of apparel incorporating the same, with optimal stretch properties important for comfortable wear, especially during athletic activities. For example, when measuring the fabric stretch and fabric growth using ASTM D2594 testing method, the double-knit textile 100 exhibits the following properties:

ASTM D2594 - Stretch/Growth Test Double-Knit Textile Length growth (60 seconds) 2% Length growth (1 hours) 2% Width growth (60 seconds) 4% Width growth (1 hour) 2%

Width is measured in the course-wise direction of the double-knit textile 100, and length is measured in the wale-wise direction of the double-knit textile 100. As shown, the double-knit textile 100 recovers to within 2% of its original length and 4% of its original width within 60 seconds which contributes to the short term and long term wearability of apparel items formed from the double-knit textile 100.

When measuring tension and elongation properties of the double-knit textile 100 using ASTM D4964 testing method, the double-knit textile 100 exhibits the following properties:

Length Stretch 134.3% Loop and 15 lbs Weight Width Stretch 245.0% Loop and 15 lbs Weight Length Loop Tension Loop Tension at 20% Elongation 0.52 lbs Loop Tension at 30% Elongation 0.94 lbs Loop Tension at 40% Elongation 1.35 lbs Loop Tension at 60% Elongation 2.21 lbs Width Loop Tension Loop Tension at 20% Elongation 0.25 lbs Loop Tension at 30% Elongation 0.68 lbs Loop Tension at 40% Elongation 1.04 lbs Loop Tension at 60% Elongation 1.67 lbs

The combination of the high degree of stretch in the length and width direction (134.4% and 245% respectively) with the low modulus value at, for instance, 40% elongation in at least the width direction (1.04 lbs) produces the sensation of “infinite stretch” or the ability to stretch with minimal force. When the double-knit textile 100 is incorporated into an apparel item, this combination enhances the comfort and wearability of the apparel item, facilitates the donning of the apparel item, and makes the apparel item particularly suitable for athletic wear which often requires the wearer to extend, flex, rotate, and the like through a wide range of motion.

The double-knit textile 100 described herein may be incorporated into a number of different apparel items including apparel items suitable for athletic wear. For example, FIG. 2 depicts a front view of a lower-body apparel item 200 formed from the double-knit textile 100. The lower-body apparel item 200 is shown in the form of a tight but it is contemplated herein that the lower-body apparel item 200 may be in the form of a short, a pant, a three-quarter tight, and the like. Further, although shown as form-fitting, it is contemplated herein that the lower-body apparel item 200 may have a looser fit.

The lower-body apparel item 200 includes a torso portion 210 defining a waist opening 211, a first leg portion 212 having a first leg opening 213, and a second leg portion 214 having a second leg opening 215. It is contemplated herein that the lower-body apparel item 200 may be entirely formed from the double-knit textile 100. Alternatively, one or more portions of the lower-body apparel item 200 may be formed of other materials including other types of knit constructions that utilize the same or different yarn types, woven materials, non-woven materials and the like. In this example, the double-knit textile 100 may be incorporated into the lower-body apparel item 200 in locations where stretch and support is desired.

The double-knit textile 100 described herein may also be incorporated into an upper-body apparel item 300 as shown in FIG. 3. The upper-body apparel item 300 is shown in the form of a shirt with sleeves but it is contemplated herein that the upper-body apparel item 300 may be in the form of a sleeveless shirt, a pullover, a jacket, and the like. Further, although shown as loose-fitting, it is contemplated herein that the upper-body apparel item 300 may be form fitting.

The upper-body apparel item 300 includes a torso portion 310 defining a waist opening 311 and a neck opening 313, a first arm portion 312 and a second arm portion 314. It is contemplated herein that the upper-body apparel item 300 may be entirely formed from the double-knit textile 100. Alternatively, one or more portions of the upper-body apparel item 300 may be formed of other materials including other types of knit constructions that utilize the same or different yarn types, woven materials, non-woven materials and the like. In this example, the double-knit textile 100 may be incorporated into the upper-body apparel item 300 in locations where stretch and support is desired.

The double-knit textile 100 may also be used in a support garment 400 as shown in FIG. 4. The support garment 400 is shown in the form of a sport bra with shoulder straps but it is contemplated herein that the support garment 400 may be in the form of a bandeau, a sport bra with a halter-style strap, a tank top, a crop top, a swimsuit top, and the like. The support garment 400 includes a first breast contacting surface 410 and a second breast contacting surface 412 where each of the first and second breast contacting surfaces 410 and 412 are configured to substantially cover a respective right and left breast of a wearer. The support garment 400 also includes shoulder straps 414 configured to extend over the shoulder regions of a wearer, and an underband 416 configured to encircle the torso portion of a wearer. It is contemplated herein that the support garment 400 may be entirely formed from the double-knit textile 100. Alternatively, one or more portions of the support garment 400 may be formed of other materials including other types of knit constructions that utilize the same or different yarn types, woven materials, non-woven materials and the like. In this example, the double-knit textile 100 may be incorporated into the support garment 400 in locations where stretch and support is desired such as, for example, the first and second breast contacting surfaces 410 and 412.

FIG. 5 is a flow diagram of an example method 500 of manufacturing an apparel item for athletic wear. At a step 510 a double-knit textile, such as the double-knit textile 100, is formed into an apparel item such as the lower-body apparel item 200, the upper-body apparel item, the support garment 400, and the like. In example aspects, the double-knit textile comprises from 65% to 70% by weight of a polyamide yarn such as the first yarn 114, and from 30% to 35% by weight of a TPU polymer yarn such as, for example, X4-zol™-J Fiber. The weight percentages of the polyamide yarn and the TPU polymer yarn cause the double-knit textile to have a weight not exceeding 300 gsm. In example aspects, and as described for the double-knit textile 100, the double-knit textile includes a technical face formed from the polyamide yarn and a technical back formed from the polyamide yarn and the TPU polymer yarn in a plated relationship. When the double-knit textile is formed into the apparel item, the technical back of the double-knit textile forms an inner-facing surface of the apparel item and the technical face forms an outer-facing surface of the apparel item. In example aspects, the technical face of the double-knit textile may form an outermost-facing surface of the apparel item, and the technical back of the double-knit textile may form an innermost-facing surface of the apparel item.

FIG. 6 is a flow diagram of an example method 600 of recycling an apparel item formed from the double-knit textile described herein. As such, the double-knit textile comprises from 65% to 70% by weight of a polyamide yarn and from 30% to 35% by weight of a thermoplastic polyurethane (TPU) polymer yarn and has a weight not exceeding 300 grams per square meter (gsm). Further, the double-knit textile has a technical face formed from the polyamide yarn, a technical back formed from the polyamide yarn and the TPU polymer yarn in a plated relationship; and a plurality of linking yarns that extend between the technical face and the technical back of the double-knit textile, where the plurality of linking yarns include the polyamide yarn. At a step 610, the apparel item is cut into a plurality of scrap pieces. Although the term “cut” is used, it is contemplated herein that any number of processes may be used to form the scrap pieces including tearing, ultrasonic cutting, water jet cutting, mechanical cutting, laser cutting, and the like. At a step 612, one or more of the scrap pieces are supplied to an extruder. In example aspects, the extruder heats the scrap pieces to a temperature at or above a melting point of the polyamide yarns and the TPU polymer yarns. The extruder then extrudes a film material that includes about 65% to 70% of polyamide material and about 30% to 35% of TPU polymer material. At a step 614, the film material is supplied to a pelletizer that produces a plurality of pellets that include about 65% to 70% of polyamide material and about 30% to 35% of TPU polymer material. The pellets may subsequently be used to form a variety of products including, for example, trim pieces, eyewear, and the like.

Aspects of the present disclosure have been described with the intent to be illustrative rather than restrictive. Alternative aspects will become apparent to those skilled in the art that do not depart from its scope. A skilled artisan may develop alternative means of implementing the aforementioned improvements without departing from the scope of the present disclosure.

It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations and are contemplated within the scope of the claims. Not all steps listed in the various figures need be carried out in the specific order described. 

What is claimed is:
 1. A double-knit textile used to form an apparel item, the double-knit textile comprising: a technical face formed from a polyamide yarn; a technical back formed from the polyamide yarn and a thermoplastic polyurethane (TPU) polymer yarn in a plated relationship; and a plurality of linking yarns that extend between the technical face and the technical back of the double-knit textile, the plurality of linking yarns including the polyamide yarn.
 2. The double-knit textile used to form the apparel item of claim 1, wherein the TPU polymer yarn is a monofilament yarn having a denier from about 60 denier to about 80 denier.
 3. The double-knit textile used to form the apparel item of claim 2, wherein the denier of the TPU polymer yarn is about 70 denier.
 4. The double-knit textile used to form the apparel item of claim 1, wherein the polyamide yarn has a denier from about 38 denier to about 45 denier.
 5. The double-knit textile used to form the apparel item of claim 4, wherein the denier of the polyamide yarn is about 40 denier.
 6. The double-knit textile used to form the apparel item of claim 4, wherein the polyamide yarn has from about 30 filaments to about 40 filaments per yarn.
 7. The double-knit textile used to form the apparel item of claim 6, wherein the polyamide yarn has about 34 filaments per yarn.
 8. The double-knit textile used to form the apparel item of claim 1, wherein the double-knit textile has a weight not exceeding 300 grams per square meter (gsm).
 9. The double-knit textile used to form the apparel item of claim 8, wherein the weight of the double-knit textile is from about 220 gsm to about 240 gsm.
 10. An apparel item for athletic wear, the apparel item comprising: a double-knit textile used to form the apparel item, the double-knit textile comprising: from 65% to 70% by weight of polyamide yarn; and from 30% to 35% by weight of thermoplastic polyurethane (TPU) polymer yarn, the double-knit textile having a weight not exceeding 300 grams per square meter (gsm).
 11. The apparel item for athletic wear of claim 10, wherein the double-knit textile comprises a technical face formed from the polyamide yarn and a technical back formed from the polyamide yarn and the TPU polymer yarn in a plated relationship.
 12. The apparel item for athletic wear of claim 11, wherein the technical face does not include the TPU polymer yarn.
 13. The apparel item for athletic wear of claim 11, wherein the double-knit textile includes a plurality of linking yarns that extend between the technical face and the technical back, the plurality of linking yarns including the polyamide yarn.
 14. The apparel item for athletic wear of claim 10, wherein the weight of the double-knit textile is from about 220 gsm to about 240 gsm.
 15. The apparel item for athletic wear of claim 10, wherein the TPU polymer yarn is elastic, and wherein the polyamide yarn is not elastic.
 16. The apparel item for athletic wear of claim 10, wherein the apparel item is an athletic tight.
 17. The apparel item for athletic wear of claim 10, wherein the apparel item is an athletic shirt.
 18. The apparel item for athletic wear of claim 10, wherein the apparel item is a sport bra.
 19. A method of manufacturing an apparel item for athletic wear, the method comprising: forming a double-knit textile into the apparel item, the double-knit textile comprising: from 65% to 70% by weight of polyamide yarn; and from 30% to 35% by weight of thermoplastic polyurethane (TPU) polymer yarn, the double-knit textile having a weight not exceeding 300 grams per square meter (gsm).
 20. The method of manufacturing the apparel item for athletic wear of claim 19, wherein the double-knit textile comprises a technical face formed from the polyamide yarn and a technical back formed from the polyamide yarn and the TPU polymer yarn in a plated relationship, and wherein the technical back forms an inner-facing surface of the apparel item. 